Culture

Easily grown in rich, medium to wet soils in full sun to part shade. Needs constant moisture. Tolerates brief flooding. Soils should never be allowed to dry out. Tolerates full sun in northern climates, but appreciates part afternoon shade in hot summer climates of the lower Midwest and South. Root mulch should be applied in cold winter climates such as St. Louis to protect the root system and to prevent root heaving. Mulch will also help retain soil moisture.

Noteworthy Characteristics

Lobelia cardinalis, commonly called cardinal flower is a Missouri native perennial which typically grows in moist locations along streams, sloughs, springs, swamps and in low wooded areas. A somewhat short-lived, clump-forming perennial which features erect, terminal spikes (racemes) of large, cardinal red flowers on unbranched, alternate-leafed stalks rising typically to a height of 2-3' (infrequently to 4'). Tubular flowers are 2-lipped, with the three lobes of the lower lip appearing more prominent than the two lobes of the upper lip. Finely-toothed, lance-shaped, dark green leaves (to 4" long). Late summer bloom period. Flowers are very attractive to butterflies and hummingbirds, but not cardinals. White and rose colored forms are also known.

Genus name honors Matthias de l'Obel (1538-1616), French physician and botanist, who with Pierre Pena wrote Stirpium Adversaria Nova (1570) which detailed a new plant classification system based upon leaves.

Specific epithet means scarlet or cardinal red.

Common name is in reference to the red robes worn by Roman Catholic cardinals.

'Queen Victoria' is more adapted to garden conditions and will generally live longer.

Problems

No serious insect or disease problems. Snails and slugs may damage the foliage. Some hybrid lobelias have not performed well at the Kemper Center in St. Louis for reasons that at this point are unclear. Foliage contains alkaloids which are very toxic to humans if ingested.

Garden Uses

Effective in moist areas of woodland/shade gardens, wet meadows or along streams or ponds. Water gardens. Rain garden. Also adds late summer bloom and height to borders as long as soils are kept uniformly moist.